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    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        // let week = ['星期一', '星期二', '星期三', '星期四', '星期五', '星期六', '星期天']
        // console.log(week[6]);
        // console.log(week.length);//数组长度

        //const声明常量（不可改变）

        // let obj = [2, 6, 1, 7, 4], sum = 0;
        // for (i = 0; i < obj.length; i++) {
        //     sum += obj[i]
        // }
        // let pin = sum / obj.length;
        // document.write("和：" + sum + '平均值：' + pin);

        let arr = [2, 6, 1, 77, 52, 25, 7], max = arr[0], min = arr[0];
        for (i = 0; i < arr.length; i++) {
            if (arr[i] > max) {
                max = arr[i];
            }
            else if (arr[i] < min) {
                min = arr[i];
            }
        }
        let cha = max - min;
        document.write(`最大值：${max},最小值：${min},他们的差为：${cha}`);





    </script>
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